It’s interesting for the home window installation niche because window installs and replacements can be about car windows and home windows. The only way to come up with a way to make sure you’re only getting home window installation jobs is in your conversion process.

Or you can work out a partnership with a Car Window replacement company and funnel those leads to them and vice versa.

If you look at their site design they have some descent graphics:

But there are a couple things they could work on design wise for the home page. Fix the columns on the bottom of the page. This might not be a bad thing when viewing on mobile but might give a viewer on a desktop a bit of trouble.

With promotion, they could do the usual. Craigslist would be low cost. Or maybe work a partnership with a contractor or remodeling company.